1. A method of measuring acoustics in a defined space, comprising:
defining an array of concealed locations throughout the defined space;
concealing a plurality of acoustic devices in the defined concealed locations by disposing the acoustic devices above and at a distance from an upper surface of a ceiling having material through which acoustics pass to reach the acoustic devices;
receiving, at an acoustic data unit, acoustic data from the plurality of acoustic devices;
converting the acoustic data by back-propagating the acoustic data to a level associated with a different point in space from where the corresponding acoustic device is located and digitizing the back-propagated acoustic data; and
outputting, from the acoustic data unit, the converted acoustic data in a serialized format that is compatible with a network protocol.
2. The method according to claim 1, further comprising coupling the acoustic data unit to a process control system operating in accordance with the network protocol such that the process control system is receptive of the converted acoustic data in the serialized format.
3. The method according to claim 1, further comprising:
multiplexing, at the acoustic data unit, the acoustic data from the plurality of acoustic devices;
converting analog signals from the plurality of acoustic devices to digital signals; and
organizing the digital signals into the serialized format.
4. The method according to claim 3, wherein the converting comprises:
weighting the analog signal from each acoustic device over a frequency range thereof;
extracting a mean-square level for each weighted analog signal;
converting the mean-square level to logarithmic values;
digitizing the logarithmic values.
5. A method of measuring acoustics in a defined space, comprising:
concealing acoustic devices above and at a distance from an upper surface of a ceiling in the defined space such that acoustics pass through ceiling material to reach the acoustic devices;
receiving analog acoustic data reflective of the acoustics passing through the ceiling material from each acoustic device;
back-propagating the analog acoustic data for each acoustic device to a level associated with a different point in space from where the corresponding acoustic device is located;
converting the back-propagated, analog acoustic data into digitized data; and
outputting, in a serialized format compatible with a network protocol, the digitized data for each acoustic device in a sequence including, for each acoustic device, the digitized data and an identification of the corresponding acoustic device.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A fluid system for a cleaning machine having a floor-treating brush or disk rotatably driven by a motor and a surrounding ring-shaped rim, comprising:
a conduit for supplying washing liquid;
a vacuum suction duct for collecting washing liquid;
a disk-shaped bottom part having substantially radially extending vacuum ducts located above the brush or disk;
a bottom cover releasably connected to the bottom part for reaching the substantially radially extending vacuum ducts; and
nozzles connected to the vacuum suction duct along a periphery of the bottom part and bottom cover, wherein the nozzles are configured for collecting washing liquid.
2. The fluid system of claim 1, wherein the substantially radially extending vacuum ducts include grooves in the disk-shaped bottom part that are open along one of their lateral faces.
3. The fluid system of claim 2, wherein the disk-shaped bottom part is located above the bottom cover when the cleaning machine is located on a floor.
4. The fluid system of claim 1, wherein the conduit for supplying washing liquid and the vacuum suction duct are disposed internally in a common central shaft that connects the vacuum suction duct to the substantially radially extending vacuum suction ducts.
5. The fluid system of claim 4, wherein the central shaft has a lower end portion that is received in a central reception opening in the bottom cover, thereby connecting the vacuum suction duct to the substantially radially extending vacuum suction ducts.
6. The fluid system of claim 5, wherein the lower end portion has a transverse wall, and a portion of the transverse wall has a shoulder that is received in the central opening in the bottom cover and that rests on an upper peripheral edge of the central opening.
7. The fluid system of claim 6, wherein an opening for letting washing liquid through from the conduit in the central shaft debouches in a bottom opening in a bottom of the central shaft.
8. The fluid system of claim 4, wherein a protecting shaft surrounds at least a portion of the central shaft.
9. The fluid system of claim 1, wherein slot-shaped openings extend through the bottom cover for the receiving parts of the ring-shaped rim.
10. The fluid system of claim 1, wherein the bottom part is configured to support a disk-shaped hub motor and to be rotationally driven by the hub motor.